a)HLL b) 68K x:=x+1 ADDQ.W #1,X IF A=7 THEN CMPI.W #7,A B:=3; BNE NEXT C:=4; MOVEQ #3,B END IF MOVEQ #4,C x:=X+2; NEXT: ADDQ.W #2,X b) At. Programmation Structurée En Assembleur by J.-P. Malengé, S. Albertsen, P. Collard and L. Andréani Masson, Paris, pages. ABCD. Operation: Source(base 10) + Destination (base 10) –>; Destination. Compatibility: Family. Assembler Syntax: ABCD Dy, Dx ABCD -(Ay), -(Ax).

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Which you choose is largely a matter of personal preference, but most people find xxx.

This bit is always clear on processor models lower than If it wasn’t so, a negative number would become positive. Only the lower byte is accessible in user mode, and of this, asesmbleur the first five bits are useful. Some assemblers won’t take certain syntaxes.

Like PC with displacement, but another register assembleurr added as well. The only exception is byte operations on A7 – this register must point to an even address, so it will always increment by at least 2.

Assembly – Wikibooks, open books for an open world

Labels are simply names for lines. Scale is not supported on all devices. Same as indirect addressing, but An will be increased by the size of the operation after the instruction is executed. Same as above, but another register will also be added.



Please make sure to follow the naming policy. Dividing books into smaller sections can provide more focus and allow each one to do one thing well, which benefits everyone. Not all assemblers will take all listed syntaxes. The and higher processors have a third register called the Master Stack Pointer. When it encounters one, it assigns it the current value assejbleur the assembler’s PC.

It can also be used as a pointer in PC relative addressing modes. W easier to read. Operate on the location pointed to by xxx. You can help by splitting this big page into smaller ones. Wikipedia has more about this subject:. CCR is just the flags. The only exception is byte operations on A7 – this register must point to an even address, so it will always decrement by at least 2.

These are typically used as pointers. If set, trace is allowed on any instruction. See External Links below. These addressing modes perform two memory accesses – first a read in to a table of addresses, second the actual read or write.

The only instructions that are allowed to use this addressing mode are: Views Read Edit View history. Detailed descriptions of every instruction in the MC family can be found in the Programmer’s Reference Manual. You can have as many labels as you want. The Program Counter PC points to the current instruction.


Other than that, I don’t know how this works. You can write this either with or without the parentheses, and most assemblers can take either one. Wikipedia has more about this subject: Retrieved from ” https: SR is the entire status register, including the system byte.

Ifs, Loops and the DBRA instruction

If set, look at M to determine what stack Assemb,eur points to. I will refer to this as “declaring” the label. This document contains information on how to program the Motorola 68K-series microprocessors in assembly language. Books to be broken into subpages Assemgleur Their assembly languages are completely different. When moving a byte or a word, the upper part of the register will remain unchanged.

The assembler you use may have different behavior. This bit is always cleared on processor models lower than In other languages Add links.

There are seven address registers: This label can then be used as an operand anywhere a number can. Determines which stack mode to use if S is set.